Cloaking using Spacetime Curvature Induced by Perturbation

Abstract

We present here a novel technique of cloaking. The related cloak is based on spacetime curvature induced by an accelerated perturbation, without any transfer of matter. First, we point out an accelerated moving perturbation modulation is an alternative to mass and moving matter for spacetime curving. Next, we outline the theory of this cloak which, following the general theory of relativity, consists in mapping the wave cloaking trajectories to a spacetime-modulation metric so as to determine the required spacetime refractive index profile. Then, we describe a practical implementation of the cloak, consisting in an SiO2 slab modulated by a circular wave pump. Compared to previously reported cloaks, the proposed cloak is immune of the issues of narrow bandwidth, single polarization, restricted cloaking size, and complex or impossible implementation. Given its unique features, this cloak should soon find its way to real-world applications. This work represents, to the best of our knowledge, the first report of spacetime curving based on perturbation modulation, without any motion of matter.